COLOR & CESIA:

University of Buenos Aires and Conicet (National Council for Research) Argentina Grupo Argentino del ColorTHE INTERACTION OF LIGHT AND COLOR

Jos Luis CAIVANO caivano@fadu.uba.ar

color

diffuse transmission (translucent)regular reflection (mirror-like)regular transmission (transparent)diffuse reflection (matte)cesia

color and cesiastimulus sensationdepends on illumination object observeris affected by visual context adaptation contrast etc.

color

cesia

inherent color perceived color S 2050-Y S 2030-Y

inherent cesia: P95, D0, L95perceived cesia: P50, D0, L95perceived cesia: P5, D0, L95the same glass window

inherent cesia: P95, D0, L95perceived cesia: P20, D0, L85the same piece of glass

Explaining some questions

non-specular directionnon-specular directionmatte surfaceglossy surfaceview from a non-specular direction

matte surfaceglossy surfaceview from a specular direction

view from non-specular direction matte glossyview from specular direction matte glossycomparison

glossy surfaces black white

reflecting blackreflecting grayreflecting whitewhite:154, 155, 153178, 179, 175205, 207, 206(R, G, B values)

reflecting blackreflecting grayreflecting whiteblack:0, 0, 018, 15, 1636, 36, 36(R, G, B values)

glossy surfaces black bluered green yellow white

reflecting blackreflecting grayreflecting whiteblue:2, 29, 1221, 50, 13116, 72, 152(R, G, B values)

reflecting blackreflecting grayreflecting whitered:87, 0, 1101, 10, 4102, 26, 29(R, G, B values)

reflecting blackreflecting grayreflecting whitegreen:1, 73, 204, 90, 4125, 108, 67(R, G, B values)

reflecting blackreflecting grayreflecting whiteyellow:143, 100, 1173, 120, 6193, 140, 29(R, G, B values)

blackgraywhite(R, G, B values)original black, gray and white images, as reflected on a glossy surface that is:0, 0, 02, 29, 12287, 0, 11, 73, 20143, 100, 1154, 155, 1534, 2, 3comparison of the colors in the previous slidesoriginal image

RGB: 76, 123, 201 HSL: 217, 62, 79 NCS: 2070 R80Bmatte finishglossy finishRGB: 17, 101, 196 HSL: 212, 91, 77 NCS: 2080 R80BThe glossy surface looks more saturated and darker.two samples taken from the same material

The same color sample with different surface finishings(seen from a non-specular direction).When the samples are seen from a specular directionthey result in different perceived colors.

matte

satin

glossy

lustrous

matte

satin

color of the light: whiteangle of illumination/observation: avoiding specular reflection black matte black glossy white matte white glossyopaque surfaces

red greenblue yellow magentacyanwith different colors of the lightopaque surfacesblack matte & glossy - white matte & glossy

black matteblack glossy

color of the light: whiteangle of illumination/observation: with inter-reflections and shadowmirror

mirror4 whites: original original reflected enhanced enhanced reflected

with different colors of the light red greenblue yellow magentacyanmirror

color of the light: whiteangle of illumination/observation: without inter-reflections and shadowmirror

mirror2 whites: original original reflected

red greenblue yellow magentacyanwith different colors of the lightmirror

color of the light: whiteangle of illumination/observation: with inter-reflections and shadowtransparent surface

transparent surface4 whites: original original shadowed enhanced enhanced filtered

transparent surfacewith different colors of the light red greenblue yellow magentacyan

color of the light: whiteangle of illumination/observation: without inter-reflections and shadowtransparent surface

transparent surface2 whites: original original filtered

transparent surfacewith different colors of the light yellow magentacyan red greenblue

Connection with environmental color design

palette extracted from inherent colors: a limited rangedoor column wall glass frame defense base sidewalk

palettes extracted from perceived color

palettes extracted from perceived color

palettes extracted from perceived color

palettes extracted from perceived color

COLOR & CESIA:

University of Buenos Aires and Conicet (National Council for Research) Argentina Grupo Argentino del ColorTHE INTERACTION OF LIGHT AND COLOR

Jos Luis CAIVANO caivano@fadu.uba.ar